Image:Niels Bohr Albert Einstein by Ehrenfest.jpg
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Niels Bohr and Albert Einstein Foto by Paul Ehrenfest (1880-1933).
The picture was taken at Ehrenfest's home in Leiden, the occasion was most likely the 50th anniversary of Hendrik Lorentz' doctorate (December 11, 1925)
source: http://www.dfi.dk/dfi/pressroom/kbhfortolkningen/ (and other sites as well)
- originally uploaded to de.wp by Graf
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